The powers of 10 are easy to remember, because we use a base 10 number system.

For 10 n with n a positive integer, just write a " 1 " with n zeros after it. For negative powers 10 − n , write " 0 ." followed by n − 1 zeros, and then a 1 .

The powers of 10 are widely used in scientific notation , so it"s a good idea to get comfortable with them.


10 1 = 10 10 1 = 1
10 2 = 100 10 -1 = 0.1
10 3 = 1000 10 -2 = 0.01
10 4 = 10,000 10 -3 = 0.001

10 5 = 100,000

(one hundred thousand)

10 -4 = 0.0001

(one ten thousandth)

10 6 = 1,000,000

(one million)

10 -5 = 0.00001

(one hundred thousandth)

10 7 = 10,000,000

(ten million)

10 -6 = 0.000001

(one millionth)

10 8 = 100,000,000

(one hundred million)

10 -7 = 0.0000001

(one ten millionth)

10 9 = 1,000,000,000

(one billion)

10 -8 = 0.00000001

(one hundred millionth)

10 10 = 10,000,000,000

(ten billion)

10 -9 = 0.000000001

(one billionth)

Click here for more names for really big and really small numbers .


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